The remains were mixed up in the transfer, Mr. Hurtic said, making identification difficult.
Domene said the fact the bodies were found with the heads, hands and feet cut off will make identification difficult.
There are dozens of militias operating along the Libyan coast, as well as special forces from several European countries including the UK, making identification difficult.
Sites from other countries provide limited information, he added, and a similar German site includes no photographs of paintings, making identification difficult.
It would also reduce the endless list of awkward choices faced by people who, for whatever reason, find gender identification difficult.
Among them, 11 had no known relatives, making DNA identification difficult, said Veronika Skvortsova, Russia's health minister.
If the contents stay in their stomachs for too long, they will get digested, making identification difficult.
In practice, parent materials can be deposited continually by wind, water, or volcanoes and can be altered from their initial, isolated state, thereby making identification difficult.
They added that they would try to trace the vehicle's identification number, but said that the looting of vehicles and the destruction of so many records would make such identification difficult.
The extreme formality of the style, however, renders much of the identification difficult, and there is no inscriptional evidence accompanying the designs to assist scholars in identification and interpretation.
In a follow-up note, Mr. Schroeder wrote that he could not be certain that the missile had not been made in Bulgaria; the scarcity of publicly available photographs and identification keys, he cautioned, make precise identification difficult.
